Calibration for Historical Crop ET Estimates A Process

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1 EVAPOTRANSPIRATION WORKSHOP Calibration for Historical Crop ET Estimates A Process Ivan A. Walter, P.E. Ivan s Engineering, Inc. 1

2 Kc ETstzd vs SCS BC Kc ET stzd is more accurate than SCS BC Kc -- Generate from measurement at known sites Kc -- Transferrable ET stzd ET professional & researchers have accepted td SCS BC Crop Coefficients derived where??? SCS BC Requires local l calibration i 2

3 Why Isn t Kc ET Used stzd Answers A to Why not? SCS BC is well accepted in Colo. Water Court. Do not have the data for ET stzd Do not have the Kc s 3

4 What is Desirable Result Just J tsome number for ETc Accurate daily Temp, Rs, U, & Rh Accurate daily ET rs & ET os Accurate monthly ET rs & ET os Excel lfil files &Programs for analysis 4

5 Criteria (ASCE Task Committee) Understandable Defensible Simplification without loss of accuracy Based on & Traceable to Experimental Data 5

6 Rocky Ford ETrs ETrs ETrs Est Apr May Jun Jul Aug Sep 6

7 Rocky Ford: Est as % of Actual 110% ETrs Est /: ETrs ETos Est / ETos 105% 100% 95% 90% 85% 80% May Jun Jul Aug Sep 7

8 Fort Morgan Daily Data 0.6 ETrs 0.5 ETrs Est 0.4 inches Apr 1-May 1-Jun 1-Jul 1-Aug 1-Sep 1-Oct 8

9 Raw Data >>>>>> ETc Download data from Web site QC the data Select good data Calc ET rs, ET os, and ET Hrgv Calibration Calc s with good data COEF Hgrv x ET Hrgv = ET rs COEF1 Hgrv x ET Hrgv = ET os 9

10 Begin Here Standardized Reference ET Equation: ET ref C n ( Rn G) u 2 ( es e T 273 (1 C d u 2 ) a ) 10

11 Begin Here w/ Data from Web 11

12 Calculate & Analyze & Compare Standardized Reference ET Equation: ET ref C n ( Rn G ) u 2 ( es e T 273 (1 C d u 2 ) a ) 1985 Hargreaves Equation: ET o ( T Tmin) ) max min 0.5 ( T mean 17.8) R a 12

13 Final Product Standardized di d Reference ET values Short Crop: ETos Tall Crop: ETrs Daily values 13

14 Step 1: XXX COAG.xls Download data from COAGMet site QC the data Identify the Good Data Fix small gaps & errors Throw out everything else 14

15 Step 2: ColCrbt2.exe -- Application Input data from XXX COAG.xls Text file XXXEtrData.prn Calculates Reference ET (daily) ETrs ASCE PM Etr, 1982 Kimberly Penman ETr ETos ASCE PM ETo, Hargreaves ETo 15

16 Step 3: Colcrbt2.exe -- Results Linear Regression Analysis (daily) Zero intercept Monthly Ratio: ET rs to ET Hgrv Monthly Ratio: ET os to ET Hgrv Monthly Ratio: ET rs to ET os Regression Coef & SEE 16

17 Step 3 Results: Ratio ET rs : ET Hrgv MAY JUN JUL AUG SEP Fort Morgan(Tdpt Adjusted) Fort Collins Center Avondale Rocky Ford Yuma Fruita Yellow Jacket

18 Center: Ratio ET rs :ET Hrgv MAY JUN JUL AUG SEP All

19 Step 3 Results: Ratio ET os : ET Hrgv MAY JUN JUL AUG SEP Fort Morgan(Tdpt Adjusted) Fort Collins Center Avondale Rocky Ford Yuma Fruita Yellow Jacket

20 Step 4: ETRETOH 2.exe Calculate ET rs & ET os using ET Hgrv Input File DataT&P.prn from XXX COAG.xls Latitude, Tmax, Tmin, Tavg COEFHRGV.dat Monthly Coefficient all Station (15 max.) 20

21 Step 4: COEFHGRV.dat 21

22 Step 4: ETRETOH 2.exe Calculation of ET rs & ET os using 1985 Hargreaves ET rs = COEF x ET Hgrv (Daily) ET os = COEF1 x ET Hgrv (Daily) ET o ( 0023( T max T min ) 0.5 ( T mean 17.8) R a 22

23 Step 4: Final Results Year, DOY, Month, Day, ETrs,ETos, ETos Precip. 23

24 ETrs ETrs Est Ft Morgan ETrs 0 Apr May Jun Jul Aug Sep 24

25 8 7 Center ETrs ETrs ETrs Est Apr May Jun Jul Aug Sep 25

26 12 Yuma2 ETrs 10 ETrs ETrs Est Apr May Jun Jul Aug Sep 26

27 Rocky Ford ETrs ETrs ETrs Est Apr May Jun Jul Aug Sep 27

28 12 Avondale ETrs 10 ETrs ETrs Est Apr May Jun Jul Aug Sep 28

29 12 Fruita ETrs 10 ETrs ETrs Est Apr May Jun Jul Aug Sep 29

30 10 Yellow Jacket ETrs ETrs ETrs Est 0 Apr May Jun Jul Aug Sep 30

31 CoAgMet Stations 8-11 Years COW HEB WFD FTC WLT ALT BRG LCN FTC GLY KSY WGG WGG FTM PTV01 0 FTL ILF HXT HYK02 18 PAI STG WRY YUM YUM01 8 AKR HRT EAC IDL01 18 KRK BRL FRT FRT01 GJC ORM01 4 CDG PAN01 0 HOT DLT OTH STN01 3.7BRL BRL SCM DVC YJK01 18 CTR CTR VLD PBL LAM04 4.6LAM FWL LJT LMS HLY AVN RFD LAM HLY RFD LAM YUC01 7.3CTZ01 18 TWC BLA LJR SAN HNE STT

32 Process -- Historical ETref Estimates CoAgMet Data XXX COAG.xls QC for Good data Colcrbt2.exe Cal c Monthly Hgrv Factors ETRETOH 2.exe Calculate ET rs & ET os 32

33 Meadow Grass ET Review of Methods Recommendation for Calculation ETc 33

34 Reported Procedures SCS BC Pasture Grass 10% / 1,000 m. change in elevation ASCE Manual al 70 does not recommend Pochop Method -- ASAE 1984 Limited i to Alfalfa (9%) & Turf (6%) Adjusted kt --- thus not true SCS BC Adjust from elevation Coefficient derived Wyoming 34

35 Reported Procedures Denver er Water Board, BC k coef. South Park, Elev. 8,900 ft msl Standard BC not modified BC Local calibration ET calculated as: Lysimeter water use + Precipitation (100%) ET irr wtr = ETc - Precipitation 35

36 Recommend Transferrable Kc Smith s Gunnison basin Hargreaves Monthly Coefficients Letter Describing included in Materials Maly & Walter Kc s Meadow Grass Memo Describing process included in Materials 36

37 Hargreaves Kc s for Meadow Grass Multiple Sites -- 5 years of data May = 1.16 June = 1.28 Jl July = August = 0.86 September =

38 Meadow Grass Kc Derived using Calibrated Hargreaves 38

39 Software & Documents Provided XXX COAG.xls -- QC data Colcrbt2.exe -- Calc Monthly Coef. ETRETOH 2.exe -- Calc ET rs & ET os Example Input and Output files Memo: Coefficients for Meadow Grass Smith Letter: Hargreaves Kc MGrass M.Grass Daily Ra calculation Application 39

40 CoAgMet Stations 8-11 Years COW HEB WFD FTC WLT ALT BRG LCN FTC GLY KSY WGG WGG FTM PTV01 0 FTL ILF HXT HYK02 18 PAI STG WRY YUM YUM01 8 AKR HRT EAC IDL01 18 KRK BRL FRT FRT01 GJC ORM01 4 CDG PAN01 0 HOT DLT OTH STN01 3.7BRL BRL SCM DVC YJK01 18 CTR CTR VLD PBL LAM04 4.6LAM FWL LJT LMS HLY AVN RFD LAM HLY RFD LAM YUC01 7.3CTZ01 18 TWC BLA LJR SAN HNE STT

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